Method for synthetizing 2,3-disubstituted dihydrobenzofuran
A benzodihydrofuran and disubstituted technology, applied in the field containing dihydrobenzofuran, can solve the problems of poor chemical selectivity and stereoselectivity of products, harsh reaction conditions, expensive reaction reagents or catalysts, etc., and achieve complete conversion of raw materials. , the effect of easy availability of raw materials and convenient separation
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Embodiment 1
[0030] Example 1: Synthesis of compound 3a
[0031]
[0032] Add substituted phenol 1a (1.0 mmol), sulfur ylide 2a (1.2 mmol), and cesium carbonate (2.5 mmol) into a reaction flask protected by nitrogen, and then add 4 ml of dry dichloromethane. After 12 hours of reaction at room temperature, saturated sodium thiosulfate solution was added to quench the reaction. After standing for liquid separation, the aqueous layer was extracted three times with dichloromethane (3×5 mL), and the organic layers were combined and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure and silica gel column chromatography was used to obtain the product compound 3a.
[0033] tran-Ethyl 3-phenyl-2,3-dihydrobenzofuran-2-carboxylate(3a). White solid, melting point 59-60°C, yield 99%, 1 H NMR(400MHz, CDCl 3 )δ7.35-7.20(m,6H), 7.00(dd,J=7.4,4.1Hz,2H), 6.91(t,J=7.4Hz,1H), 5.03(d,J=6.6Hz,1H), 4.81(d,J=6.5Hz,1H), 4.29(ddd,J=12.5,7.5,2.8Hz,2H), 1.31(t,J=7.1Hz,3H); 13 C NMR(100MH...
Embodiment 2
[0034] Example 2: Synthesis of compound 3b
[0035]
[0036] Add substituted phenol 1b (1.0 mmol), sulfur ylide 2a (1.2 mmol), and cesium carbonate (2.5 mmol) into a reaction flask protected by nitrogen, and then add 4 ml of dry dichloromethane. After 12 hours of reaction at room temperature, saturated sodium thiosulfate solution was added to quench the reaction. After standing for liquid separation, the aqueous layer was extracted three times with dichloromethane (3×5 mL), and the organic layers were combined and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure and silica gel column chromatography was used to obtain the product compound 3b.
[0037] tran-Ethyl 3-ethyl-2,3-dihydrobenzofuran-2-carboxylate(3j). Colorless liquid, yield 77%; 1 H NMR(400MHz, CDCl 3 )δ7.16(t,J=7.8Hz,2H),6.91-6.88(m,2H),4.82(d,J=5.4Hz,1H),4.33-4.18(m,2H),3.50(dd,J =12.7,5.7Hz,1H),1.81(ddd,J=21.4,10.7,6.2Hz,2H),1.29(t,J=7.1Hz,3H),1.03(t,J=7.4Hz,3H); 13 C NMR(100MHz, CDC...
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